Advice for Repairing Alpine MRV 1507

Rozza · 31st July 2011, 10:32 PM

Hi, After having issues with the protection light coming on and large current draw when sitting powered up on a bench with nothing connected to the output i have replaced all of the output transistors and i now have another issue...

when the amp is powered up all of the three led's are flashing different colours and then every 5 seconds there is a kind of power dip and a strange high pitched noise similar to a tropical insect coming from a component around the area of one the large transformer coils for a few seconds and then it will stop and the cycle starts again

just wondering what i should start with next, the capacitors in the area dont look inflated or to be leaking but i ws thinking of desoldering and testing these next

any advice appreciated, cheers

Perry Babin · 1st August 2011, 01:10 AM

Did you re-adjust the bias in the audio section after replacing the outputs?

Don't do anything with the capacitors.

Rozza · 1st August 2011, 03:35 AM

Hi, all I've done so far is replace the transistors and power up the unit for a minute

Perry Babin · 1st August 2011, 04:28 AM

The bias may be too high for the new transistors. Re-adjust it and see if that helps.

Rozza · 1st August 2011, 11:50 AM

ok cheers i'll give that a go, would the procedure for doing this be in the service manual as im having trouble trying to find one to download,

my email adress is gtfalcon351 (a t) hotmail (d o t) com if anyone has one to share thanks

Perry Babin · 1st August 2011, 11:54 AM

It's in the service manual. Email me if you want it.
babin_perry@yahoo.com

The procedure is essentially as shown in the following interactive demo.
http://www.bcae1.com/temp/ausettingbias.swf

31st July 2011, 10:32 PM	#1
Rozza diyAudio Member Join Date: Jul 2011	Advice for Repairing Alpine MRV 1507 Hi, After having issues with the protection light coming on and large current draw when sitting powered up on a bench with nothing connected to the output i have replaced all of the output transistors and i now have another issue... when the amp is powered up all of the three led's are flashing different colours and then every 5 seconds there is a kind of power dip and a strange high pitched noise similar to a tropical insect coming from a component around the area of one the large transformer coils for a few seconds and then it will stop and the cycle starts again just wondering what i should start with next, the capacitors in the area dont look inflated or to be leaking but i ws thinking of desoldering and testing these next any advice appreciated, cheers

1st August 2011, 01:10 AM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Did you re-adjust the bias in the audio section after replacing the outputs? Don't do anything with the capacitors. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

1st August 2011, 04:28 AM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	The bias may be too high for the new transistors. Re-adjust it and see if that helps. __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

1st August 2011, 11:54 AM	#6
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	It's in the service manual. Email me if you want it. babin_perry@yahoo.com The procedure is essentially as shown in the following interactive demo. http://www.bcae1.com/temp/ausettingbias.swf __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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1st August 2011, 03:35 AM	#3
Rozza diyAudio Member Join Date: Jul 2011	Hi, all I've done so far is replace the transistors and power up the unit for a minute

1st August 2011, 11:50 AM	#5
Rozza diyAudio Member Join Date: Jul 2011	ok cheers i'll give that a go, would the procedure for doing this be in the service manual as im having trouble trying to find one to download, my email adress is gtfalcon351 (a t) hotmail (d o t) com if anyone has one to share thanks

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